Improvement in cast-iron steam-generators



j J. GHILOOTT. CAST IRON STEAM GENERATOR.

No. 48,518. Patented July 4, I865.

e a UNITED STATES PATENT QFFICE.-

. JOHN GHILOOTT, OFIBROOKLYN, .NEW, YORK.

. IMPROVEMENT IN CAST-IRON STEAM- GENERATORS.

Specification forming part of Letters Patent No. 48,518, dated July 4, 1865; anteda'ted June 21, 1865.

To all whom itmay'concem Be it known that I, JOHN Cartoon, of Brooklyn, in thecou-nty of Kings and State of- New York,have invented a. new anduseful Improvement in Cast-Iron Tubular Steam-Gen erators; and'I do hereby declare that the fol- I lowing is a full, clear, and'exact description of the same, reference being had to the accompanying drawings, forming partof this speeifica- (last-iron, it is well known,is capable of resisting a much greater compressive .thantensional force, andone of the best .forms for re-. sisting compressive force is the arch.

Qneobject of this invention is to takeadvantage of the above-mentioned properties of cast-iron and the arch in the construction of steam-generators. the water and steam spaces of which are composed of tubes. .Another o'bject is to increase theheating-surface of the tubes, and to provide for the better formation between them -ot' flues for the circulation of gaseous products of combustion.

To these ends my said invention consists in r the construction ofa steam-generator of tiers Similar letters of reference indicate some spondin g parts in theseveralfigures.

AA A A are the cast-iron arch-sided polygonaltubes. These are represented as having four sides, but may be made with any desired; v. number. In the boiler represented the tubes are cast with closed ends; but the said tubes. may becast with open ends and have their" ends closed by caps applied and securedin any suitable manner. The said tubes are repre y sentedas connected atone end-by means of a H pipes B B, to provide for-a proper circulation, 1 p e p of steam and water. They may, however, be

similarly connected at both ends, or at suitable.

points in their length. The'tubcs A, and A are representedin Fig.4 as exposed directlyto the vertically-radiating.heat from the fire on the grate l); In Fig.3 the arrows indicatethe' manner in which the heated gaseous products of combustion circulate between A and A and through an opening, a, in the vertical longitudinal partition-wall E, provided between A A and A A, to circulate between A and A on their way to the chimney, the spaces 1) Ii between the several tiers of tubes forming'flues;

A similar systernot' circulation may be further carried out by increasing the number of tiers. What I claiinas my invention, and desire to secure by Letters Patent, is

v A steam-generator compose'dof tiers of archsided polygonal castiron water and steam tubes, arranged, substantially as herein as.

scribed, to form lines between the tiers. V

- JOHN OHILOOTT.

Witnesses:

. HIPPOLYTE MALI, J. W. GooMBs. 

